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//! # My Crate
//!
//! `my_crate` is a collection of utilities to make performing certain
//! calculations more convenient.

use std::env;
use std::error::Error;
use std::fs;

///
/// config de run 方法
///
/// # examples
///
/// ```
/// let result = config::run(config: Config)
/// println!(result)
/// ```
///
///
pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
    println!("config: {:?}", config);
    let contents = fs::read_to_string(config.file_name)?;

    let vecs = if config.case_sensitive {
        search(&config.query_word, &contents)
    } else {
        search_no_case_sensitive(&config.query_word, &contents)
    };

    for line in &vecs {
        println!("line:{}", line);
    }
    println!("vecs:{:?}", vecs);
    Ok(())
}

#[derive(Debug)]
pub struct Config {
    query_word: String,
    file_name: String,
    case_sensitive: bool,
}

// pub fn parse_config(args: &[String]) -> Config {
//     let query_word = args[1].to_string();
//     let file_name = args[2].to_string();

//     Config {
//         query_word,
//         file_name,
//     }
// }

impl Config {
    pub fn new(mut args: env::Args) -> Result<Config, &'static str> {
        args.next();

        let query_word = match args.next() {
            Some(v) => v,
            None => return Err("Didn't get a query string"),
        };

        let file_name = match args.next() {
            Some(v) => v,
            None => return Err("Didn't get a file name"),
        };

        let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
        println!("case_sensitive:{}", case_sensitive);
        Ok(Config {
            query_word,
            file_name,
            case_sensitive,
        })
    }
}

fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    // let mut vecs = Vec::new();
    // for line in contents.lines() {
    //     if line.contains(query) {
    //         vecs.push(line);
    //     }
    // }
    // vecs

    contents
        .lines()
        .filter(|line| line.contains(query))
        .collect()
}

fn search_no_case_sensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    let mut vecs = Vec::new();
    let query = query.to_lowercase();

    for line in contents.lines() {
        if line.to_lowercase().contains(&query) {
            vecs.push(line);
        }
    }

    vecs
}

#[cfg(test)]
mod tests {

    #[test]
    fn test() {
        let query = "Duct";
        let contents = "\
Rust:
safe, fast, productive.
Pick three";

        assert_eq!(
            vec!["safe, fast, productive."],
            super::search(query, contents)
        );
    }

    #[test]
    fn search_no_case_sensitive() {
        let query = "Duct";
        let contents = "\
Rust:
safe, fast, productive.
Ductory";
        assert_eq!(
            vec!["Ductory"],
            super::search_no_case_sensitive(query, contents)
        );
    }
}